Light Manipulation by Single Cells: The Case of Diatoms

Figure 3

Raman spectra of a single valve of C. wailesii in the range 400–3200  acquired after removal of organic content from the frustule. The red curves refer to the mean over 20 spectra acquired in different points of the valve. Black curves refer to the mean over three spectra where the presence of sulfur composites has been detected. The assignments of the bands are as follows: 450–550 : Si-O-Si stretching vibrations; 800–850 : symmetric stretching; 900–950 : / symmetric stretching (not indicated in figure for clarity purpose); 950–1050 : CC aromatic ring chain vibrations; 1050–1100 : symmetric stretching (not indicated in figure for clarity purpose); 1150–1200 : CS; 1450–1550 : //CC; 2100–2250 : CC; 2550–2600 : SH; 2800–3000 : C-H stretching vibration.